/* ========================================
   リセット & ベーススタイル
========================================= */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

:root {
    --primary-color: #667eea;
    --primary-dark: #5568d3;
    --secondary-color: #764ba2;
    --text-dark: #2d3748;
    --text-light: #718096;
    --bg-light: #f7fafc;
    --bg-white: #ffffff;
    --border-color: #e2e8f0;
    --shadow: 0 10px 30px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 20px 60px rgba(0, 0, 0, 0.15);
}

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    line-height: 1.6;
    color: var(--text-dark);
    background: var(--bg-white);
    overflow-x: hidden;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
}

/* ========================================
   ヘッダー
========================================= */
.header {
    background: var(--bg-white);
    border-bottom: 1px solid var(--border-color);
    padding: 20px 0;
    position: sticky;
    top: 0;
    z-index: 1000;
    backdrop-filter: blur(10px);
    background: rgba(255, 255, 255, 0.95);
}

.header-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo {
    display: flex;
    align-items: center;
    gap: 10px;
    font-size: 24px;
    font-weight: 800;
    color: var(--primary-color);
}

.logo i {
    font-size: 28px;
}

.nav {
    display: flex;
    align-items: center;
    gap: 30px;
}

.nav a {
    text-decoration: none;
    color: var(--text-dark);
    font-weight: 500;
    transition: color 0.3s;
}

.nav a:hover {
    color: var(--primary-color);
}

.btn-login {
    background: linear-gradient(135deg, var(--primary-color) 0%, var(--secondary-color) 100%);
    color: white !important;
    padding: 10px 25px;
    border-radius: 25px;
    transition: transform 0.3s, box-shadow 0.3s;
}

.btn-login:hover {
    transform: translateY(-2px);
    box-shadow: 0 5px 15px rgba(102, 126, 234, 0.3);
}

/* ========================================
   ヒーローセクション
========================================= */
.hero {
    padding: 80px 0;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    position: relative;
    overflow: hidden;
}

.hero::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: url('data:image/svg+xml,<svg width="100" height="100" xmlns="http://www.w3.org/2000/svg"><circle cx="50" cy="50" r="40" fill="rgba(255,255,255,0.05)"/></svg>');
    opacity: 0.3;
}

/* 創設メンバーバナー */
.founder-banner {
    background: linear-gradient(135deg, #ffd700 0%, #ffed4e 100%);
    color: #2d3748;
    padding: 15px 30px;
    border-radius: 50px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 20px;
    margin-bottom: 40px;
    box-shadow: 0 10px 40px rgba(255, 215, 0, 0.3);
    position: relative;
    z-index: 2;
    animation: slide-down 0.6s ease-out;
}

@keyframes slide-down {
    from {
        transform: translateY(-30px);
        opacity: 0;
    }
    to {
        transform: translateY(0);
        opacity: 1;
    }
}

.founder-badge {
    background: #ff6b6b;
    color: white;
    padding: 8px 16px;
    border-radius: 20px;
    font-weight: 700;
    font-size: 14px;
    white-space: nowrap;
    animation: pulse 2s infinite;
}

@keyframes pulse {
    0%, 100% {
        transform: scale(1);
    }
    50% {
        transform: scale(1.05);
    }
}

.founder-text {
    flex: 1;
    font-size: 16px;
    font-weight: 600;
}

.highlight-gold {
    font-size: 20px;
    font-weight: 800;
    color: #ff6b6b;
}

.founder-timer {
    display: flex;
    align-items: center;
    gap: 8px;
    font-weight: 700;
    font-size: 15px;
    white-space: nowrap;
}

.founder-timer i {
    animation: tick 1s infinite;
}

@keyframes tick {
    0%, 100% {
        transform: rotate(0deg);
    }
    25% {
        transform: rotate(-10deg);
    }
    75% {
        transform: rotate(10deg);
    }
}

.hero-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 60px;
    align-items: center;
    position: relative;
    z-index: 1;
}

.hero-title {
    font-size: 52px;
    font-weight: 800;
    line-height: 1.2;
    margin-bottom: 20px;
}

.highlight {
    background: linear-gradient(to right, #ffd700, #ffed4e);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.hero-description {
    font-size: 18px;
    line-height: 1.8;
    margin-bottom: 30px;
    opacity: 0.95;
}

.hero-buttons {
    display: flex;
    gap: 15px;
    margin-bottom: 20px;
}

.btn-primary,
.btn-secondary {
    display: inline-flex;
    align-items: center;
    gap: 10px;
    padding: 15px 30px;
    border-radius: 30px;
    text-decoration: none;
    font-weight: 600;
    font-size: 16px;
    transition: all 0.3s;
}

.btn-primary {
    background: white;
    color: var(--primary-color);
    box-shadow: 0 5px 20px rgba(0, 0, 0, 0.2);
    position: relative;
}

.btn-primary:hover {
    transform: translateY(-3px);
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.3);
}

.btn-primary.pulse {
    animation: btn-pulse 2s infinite;
}

@keyframes btn-pulse {
    0%, 100% {
        box-shadow: 0 5px 20px rgba(0, 0, 0, 0.2);
    }
    50% {
        box-shadow: 0 5px 30px rgba(255, 215, 0, 0.6);
    }
}

.btn-primary.large {
    padding: 18px 40px;
    font-size: 18px;
}

.btn-secondary {
    background: rgba(255, 255, 255, 0.2);
    color: white;
    border: 2px solid white;
}

.btn-secondary:hover {
    background: white;
    color: var(--primary-color);
}

.hero-note {
    font-size: 14px;
    opacity: 0.9;
    display: flex;
    gap: 20px;
    align-items: center;
}

.hero-note i {
    color: #ffd700;
}

/* ダッシュボードプレビュー */
.dashboard-preview {
    background: white;
    border-radius: 20px;
    box-shadow: var(--shadow-lg);
    overflow: hidden;
    transform: perspective(1000px) rotateY(-5deg);
    transition: transform 0.5s;
}

.dashboard-preview:hover {
    transform: perspective(1000px) rotateY(0deg);
}

.preview-header {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    padding: 15px;
    display: flex;
    gap: 8px;
}

.preview-dot {
    width: 12px;
    height: 12px;
    border-radius: 50%;
    background: rgba(255, 255, 255, 0.3);
}

.preview-content {
    padding: 30px;
}

.preview-stats {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 15px;
    margin-bottom: 25px;
}

.stat-box {
    text-align: center;
    padding: 15px;
    background: var(--bg-light);
    border-radius: 10px;
}

.stat-icon {
    color: var(--primary-color);
    font-size: 24px;
    margin-bottom: 8px;
}

.stat-value {
    font-size: 20px;
    font-weight: 700;
    color: var(--text-dark);
    margin-bottom: 5px;
}

.stat-label {
    font-size: 12px;
    color: var(--text-light);
}

.preview-list {
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.preview-item {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 15px;
    background: var(--bg-light);
    border-radius: 10px;
}

.item-info {
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex: 1;
}

.item-name {
    font-weight: 600;
    color: var(--text-dark);
}

.item-price {
    font-weight: 700;
    color: var(--primary-color);
}

.item-badge {
    padding: 5px 12px;
    border-radius: 20px;
    font-size: 12px;
    font-weight: 600;
    margin-left: 15px;
}

.item-badge.entertainment {
    background: #fce4ec;
    color: #e74c3c;
}

.item-badge.business {
    background: #e3f2fd;
    color: #3498db;
}

/* ========================================
   問題提起セクション
========================================= */
.problem {
    padding: 80px 0;
    background: var(--bg-light);
}

.section-title {
    text-align: center;
    font-size: 40px;
    font-weight: 800;
    margin-bottom: 20px;
    color: var(--text-dark);
}

.section-subtitle {
    text-align: center;
    font-size: 18px;
    color: var(--text-light);
    margin-bottom: 50px;
}

.problem-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 30px;
}

.problem-card {
    background: white;
    padding: 30px;
    border-radius: 15px;
    box-shadow: var(--shadow);
    text-align: center;
    transition: transform 0.3s;
}

.problem-card:hover {
    transform: translateY(-5px);
}

.problem-icon {
    font-size: 48px;
    margin-bottom: 15px;
}

.problem-card h3 {
    font-size: 20px;
    margin-bottom: 10px;
    color: var(--text-dark);
}

.problem-card p {
    color: var(--text-light);
    line-height: 1.6;
}

/* ========================================
   機能セクション
========================================= */
.features {
    padding: 80px 0;
    background: white;
}

.features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 30px;
}

.feature-card {
    padding: 30px;
    background: var(--bg-light);
    border-radius: 15px;
    transition: all 0.3s;
}

.feature-card:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow);
    background: white;
}

.feature-icon {
    width: 60px;
    height: 60px;
    background: linear-gradient(135deg, var(--primary-color) 0%, var(--secondary-color) 100%);
    border-radius: 15px;
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    font-size: 28px;
    margin-bottom: 20px;
}

.feature-card h3 {
    font-size: 20px;
    margin-bottom: 10px;
    color: var(--text-dark);
}

.feature-card p {
    color: var(--text-light);
    line-height: 1.7;
}

/* ========================================
   メリットセクション
========================================= */
.benefits {
    padding: 80px 0;
    background: var(--bg-light);
}

.benefits-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 30px;
}

.benefit-card {
    background: white;
    padding: 40px;
    border-radius: 15px;
    box-shadow: var(--shadow);
    position: relative;
    overflow: hidden;
}

.benefit-number {
    position: absolute;
    top: 20px;
    right: 20px;
    font-size: 72px;
    font-weight: 800;
    color: rgba(102, 126, 234, 0.1);
}

.benefit-card h3 {
    font-size: 22px;
    margin-bottom: 15px;
    color: var(--text-dark);
    position: relative;
    z-index: 1;
}

.benefit-card p {
    color: var(--text-light);
    line-height: 1.7;
    position: relative;
    z-index: 1;
}

/* ========================================
   使い方セクション
========================================= */
.how-it-works {
    padding: 80px 0;
    background: white;
}

.steps {
    max-width: 600px;
    margin: 0 auto 60px;
}

.step {
    display: flex;
    gap: 30px;
    align-items: center;
    padding: 30px;
    background: var(--bg-light);
    border-radius: 15px;
    margin-bottom: 20px;
}

.step-number {
    width: 60px;
    height: 60px;
    background: linear-gradient(135deg, var(--primary-color) 0%, var(--secondary-color) 100%);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    font-size: 28px;
    font-weight: 800;
    flex-shrink: 0;
}

.step-content h3 {
    font-size: 22px;
    margin-bottom: 10px;
    color: var(--text-dark);
}

.step-content p {
    color: var(--text-light);
    line-height: 1.7;
}

.step-arrow {
    text-align: center;
    color: var(--primary-color);
    font-size: 32px;
    margin: 10px 0;
}

.cta-box {
    text-align: center;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    padding: 60px 40px;
    border-radius: 20px;
    color: white;
}

.cta-box h3 {
    font-size: 32px;
    margin-bottom: 30px;
}

.cta-note {
    margin-top: 15px;
    font-size: 14px;
    opacity: 0.9;
}

/* ========================================
   FAQ
========================================= */
.faq {
    padding: 80px 0;
    background: var(--bg-light);
}

.faq-list {
    max-width: 800px;
    margin: 0 auto;
}

.faq-item {
    background: white;
    padding: 25px;
    border-radius: 10px;
    margin-bottom: 15px;
    box-shadow: var(--shadow);
}

.faq-question {
    display: flex;
    align-items: center;
    gap: 15px;
    margin-bottom: 15px;
}

.faq-question i {
    color: var(--primary-color);
    font-size: 24px;
}

.faq-question h3 {
    font-size: 18px;
    color: var(--text-dark);
}

.faq-answer p {
    color: var(--text-light);
    line-height: 1.8;
    padding-left: 40px;
}

/* ========================================
   Final CTA
========================================= */
.final-cta {
    padding: 100px 0;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    text-align: center;
}

.final-cta-content h2 {
    font-size: 48px;
    margin-bottom: 20px;
}

.final-cta-content p {
    font-size: 20px;
    margin-bottom: 40px;
    opacity: 0.95;
}

/* ========================================
   フッター
========================================= */
.footer {
    padding: 40px 0;
    background: var(--text-dark);
    color: white;
    text-align: center;
}

.footer-content {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 15px;
}

.footer-logo {
    display: flex;
    align-items: center;
    gap: 10px;
    font-size: 20px;
    font-weight: 700;
}

.footer-logo i {
    font-size: 24px;
}

/* ========================================
   レスポンシブデザイン
========================================= */
@media (max-width: 768px) {
    .nav {
        display: none;
    }
    
    .founder-banner {
        flex-direction: column;
        text-align: center;
        padding: 20px;
        gap: 15px;
    }
    
    .founder-text {
        font-size: 14px;
    }
    
    .highlight-gold {
        font-size: 18px;
    }
    
    .hero-content {
        grid-template-columns: 1fr;
        gap: 40px;
    }
    
    .hero-title {
        font-size: 36px;
    }
    
    .hero-description {
        font-size: 16px;
    }
    
    .hero-buttons {
        flex-direction: column;
    }
    
    .btn-primary,
    .btn-secondary {
        width: 100%;
        justify-content: center;
    }
    
    .dashboard-preview {
        transform: none;
    }
    
    .preview-stats {
        grid-template-columns: 1fr;
    }
    
    .section-title {
        font-size: 32px;
    }
    
    .problem-grid,
    .features-grid,
    .benefits-grid {
        grid-template-columns: 1fr;
    }
    
    .step {
        flex-direction: column;
        text-align: center;
    }
    
    .final-cta-content h2 {
        font-size: 32px;
    }
}